Re: [PATCH v2] gr: fallback to legacy paths during firmware lookup

[Peter Wu <peter-VTkQYDcBqhK7DlmcbJSQ7g@public.gmane.org>]

On Fri, Nov 04, 2016 at 06:36:17PM +0900, Alexandre Courbot wrote:
> Look for firmware files using the legacy ("nouveau/nvxx_fucxxxx") path
> if they cannot be found in the new, "official" path. User setups were
> broken by the switch, which is bad.
> 
> There are only 4 firmware files we may want to look up that way, so
> hardcode them into the lookup function. All new firmware files should
> use the standard "nvidia/<chip>/gr/" path.
> 
> Fixes: 8539b37acef7 ("drm/nouveau/gr: use NVIDIA-provided external firmwares")
> Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
> ---
> Changes since v1:
> * Moved file name translation into the legacy function
> 
>  drm/nouveau/nvkm/engine/gr/gf100.c | 53 +++++++++++++++++++++++++++++++++++---
>  1 file changed, 49 insertions(+), 4 deletions(-)
> 
> diff --git a/drm/nouveau/nvkm/engine/gr/gf100.c b/drm/nouveau/nvkm/engine/gr/gf100.c
> index eccdee04107d..ed45f923442f 100644
> --- a/drm/nouveau/nvkm/engine/gr/gf100.c
> +++ b/drm/nouveau/nvkm/engine/gr/gf100.c
> @@ -1756,6 +1756,53 @@ gf100_gr_ = {
>  };
>  
>  int
> +gf100_gr_ctor_fw_legacy(struct gf100_gr *gr, const char *fwname,
> +			struct gf100_gr_fuc *fuc, int ret)
> +{
> +	struct nvkm_subdev *subdev = &gr->base.engine.subdev;
> +	struct nvkm_device *device = subdev->device;
> +	const struct firmware *fw;
> +	char f[32];
> +
> +	/* see if this firmware has a legacy path */
> +	if (!strcmp(fwname, "fecs_inst"))
> +		fwname = "fuc409c";
> +	else if (!strcmp(fwname, "fecs_data"))
> +		fwname = "fuc409d";
> +	else if (!strcmp(fwname, "gpccs_inst"))
> +		fwname = "fuc41ac";
> +	else if (!strcmp(fwname, "gpccs_data"))
> +		fwname = "fuc41ad";
> +	else
> +		fwname = NULL;
> +
> +	/* nope, let's just return the error we got */
> +	if (!fwname) {
> +		nvkm_error(subdev, "failed to load %s\n", fwname);

Due to the rename from legacy_fwname -> fwname, this can be NULL.
What about replacing the else branch above by this block?

Kind regards,
Peter

> +		return ret;
> +	}
> +
> +	/* yes, try to load from the legacy path */
> +	nvkm_debug(subdev, "%s: falling back to legacy path\n", fwname);
> +
> +	snprintf(f, sizeof(f), "nouveau/nv%02x_%s", device->chipset, fwname);
> +	ret = request_firmware(&fw, f, device->dev);
> +	if (ret) {
> +		snprintf(f, sizeof(f), "nouveau/%s", fwname);
> +		ret = request_firmware(&fw, f, device->dev);
> +		if (ret) {
> +			nvkm_error(subdev, "failed to load %s\n", fwname);
> +			return ret;
> +		}
> +	}
> +
> +	fuc->size = fw->size;
> +	fuc->data = kmemdup(fw->data, fuc->size, GFP_KERNEL);
> +	release_firmware(fw);
> +	return (fuc->data != NULL) ? 0 : -ENOMEM;
> +}
> +
> +int
>  gf100_gr_ctor_fw(struct gf100_gr *gr, const char *fwname,
>  		 struct gf100_gr_fuc *fuc)
>  {
> @@ -1765,10 +1812,8 @@ gf100_gr_ctor_fw(struct gf100_gr *gr, const char *fwname,
>  	int ret;
>  
>  	ret = nvkm_firmware_get(device, fwname, &fw);
> -	if (ret) {
> -		nvkm_error(subdev, "failed to load %s\n", fwname);
> -		return ret;
> -	}
> +	if (ret)
> +		return gf100_gr_ctor_fw_legacy(gr, fwname, fuc, ret);
>  
>  	fuc->size = fw->size;
>  	fuc->data = kmemdup(fw->data, fuc->size, GFP_KERNEL);
> -- 
> 2.10.0
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